[osg-submissions] Added LightPointNode pointSprite flag to .ive & .osg write/read methods

[Wojciech Lewandowski]

Hi, Robert

I have found that ive and osg does not store/read pointSprite selection flag for osgSim::LightPointNode. Attached are modifications in ive & osg osgSim plugins. 
I susppose this modification breaks backward compatibility. I don't know whats your policy in such cases. Is there an option to test file version and parse & interpret data conditionally ?

Cheers,
Wojtek
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